Iterm2 keep ssh session alive12/31/2023 If you have administrator access to the server, you can configure the ClientAliveInterval, TCPKeepAlive and ClientAliveCountMax options in the SSHd configuration file. ProtocolKeepAlives and SetupTimeOut are Debian-specific compatibility aliases for this option. this session will be persistent as long as the remote computer is alive. to prevent this kind of inproductivity, tmux comes in. but when you are working with long running task, your ssh session will be disconnected. This option applies to protocol version 2 only. 1 The ssh session will expire in 3 x 120 seconds and the program will also stop 2 The ssh session will be kept alive and the program will not stop 3 The ssh session will expire but the program on the headless box will not stop 4 I got something wrong and the above doesnt make sense. When you are working with remote compute, usally you use SSH.If you connect to multiple servers via SSH, set it on. Either you send the alive message from the client to the server or from the server to the client. The default is 0, indicating that these messages will not be sent to the server, or 300 if the BatchMode option is set. This way, you keep the SSH session alive because there is a communication between the client and server and the server understands that client is still there. Sets a timeout interval in seconds after which if no data has been received from the server, ssh(1) will send a message through the encrypted channel to request a response from the server. This option applies to protocol version 2 only in protocol version 1 there is no mechanism to request a response from the server to the server alive messages, so disconnection is the responsibility of the TCP stack. Want to organize your work by naming clusters of windows for different things you’re working on Tmux can rename the tabs to keep you organized. If, for example, ServerAliveInterval (see below) is set to 15 and ServerAliveCountMax is left at the default, if the server becomes unresponsive, ssh will disconnect after approximately 45 seconds. The server alive mechanism is valuable when the client or server depend on knowing when a connection has become inactive. The TCP keepalive option enabled by TCPKeepAlive is spoofable. It doesn’t matter if the packet is sent from the client or the server, as long as there is some communication going. The server alive messages are sent through the encrypted channel and therefore will not be spoofable. Here’s how to keep your SSH sessions alive and prevent the SSH timeout: By sending a null packet between the client and the server at a specified interval that is smaller than the timeout value, we can avoid SSH timeout. If the client does not receive a response after two tries (as specified by the ServerAliveCountMax setting), it closes the connection. It is important to note that the use of server alive messages is very different from TCPKeepAlive (below). With this configuration, the SSH client sends a packet to the server every 240 seconds (4 minutes) to keep the connection alive. If this threshold is reached while server alive messages are being sent, ssh will disconnect from the server, terminating the session. Sets the number of server alive messages (see below) which may be sent without ssh(1) receiving any messages back from the server. From the ssh_config man page: ServerAliveCountMax:
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